The Dynamics of Eye Formation and Maintenance in Axisymmetric Diabatic Vortices
The Dynamics of Eye Formation and Maintenance in Axisymmetric Diabatic Vortices
复制标题
轴对称非绝热涡旋眼形成和维持的动力学
DOI：
--
复制
发表时间：
2009
期刊：
影响因子：
--
通讯作者：
T. Dunkerton
中科院分区：
文献类型：
--
作者：
V. Wirth;T. Dunkerton
摘要本文研究了在非绝热强迫作用下理想轴对称平衡涡中眼的发生、形成和维持。模型设置的两个关键要素是朝向指定平衡温度Te的温度松弛和来自湍流边界层的Ekman泵送。此外，流动被假定为几乎是无粘性的内部。该模式没有试图关闭任何湿对流。作者以前的工作表明，有一个连续的过渡，从季风状涡飓风状涡。这种转变由比率F = αT /cD控制，其中αT是热弛豫速率，cD是表面阻力系数。风眼的定义是垂直风，最大上升流发生在某个有限半径处，而不是在原点处。即使Te在原点处最大，也就是说，即使Te在某个有限半径处不直接倾向于上升流，也有可能得到一个眼。眼睛的出现是……
Abstract This paper investigates the occurrence, formation, and maintenance of eyes in idealized axisymmetric balanced vortices with diabatic forcing. Two key elements of the model setup are temperature relaxation toward a specified equilibrium temperature Te and Ekman pumping from a turbulent boundary layer. Furthermore, the flow is assumed to be almost inviscid in the interior. The model does not attempt any closure for moist convection. Previous work by the authors has shown that there is a continuous transition from monsoonlike vortices to hurricane-like vortices. This transition is governed by the ratio F = αT /cD, where αT is the thermal relaxation rate and cD the surface drag coefficient. An eye is defined in terms of the vertical wind with maximum upwelling occurring at some finite radius rather than at the origin. It is possible to obtain an eye even though Te maximizes at the origin, that is, even though Te does not directly predispose upwelling at some finite radius. The occurrence of an eye is...